Revert "Remove the HTMLVideoElement-specific prefixed fullscreen API"

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index f8d9a2a3700008b8a14ed8306fe0087ebba0725a..36520df9d92877fabfd4a2b404cd43d70fd3d157 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -661,6 +661,24 @@ String UseCounter::deprecationMessage(Feature feature)
     case SVGElementGetPresentationAttribute:
         return "CSSValue and SVGElement.getPresentationAttribute are deprecated. Please use getPropertyValue and parse the return value instead.";
 
+    case PrefixedVideoSupportsFullscreen:
+        return "'HTMLVideoElement.webkitSupportsFullscreen' is deprecated. Its value is true if the video is loaded.";
+
+    case PrefixedVideoDisplayingFullscreen:
+        return "'HTMLVideoElement.webkitDisplayingFullscreen' is deprecated. Please use the 'fullscreenchange' and 'webkitfullscreenchange' events instead.";
+
+    case PrefixedVideoEnterFullscreen:
+        return "'HTMLVideoElement.webkitEnterFullscreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.";
+
+    case PrefixedVideoExitFullscreen:
+        return "'HTMLVideoElement.webkitExitFullscreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
+
+    case PrefixedVideoEnterFullScreen:
+        return "'HTMLVideoElement.webkitEnterFullScreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.";
+
+    case PrefixedVideoExitFullScreen:
+        return "'HTMLVideoElement.webkitExitFullScreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
+
     case PrefixedMediaSourceOpen:
         return "'WebKitMediaSource' is deprecated. Please use 'MediaSource' instead.";